Simmias of Rhodes was a poet and scholar active in the early Hellenistic period, around 300 BCE. Originally from Rhodes, he worked in Alexandria, where he was part of the intellectual circle associated with the early Library and Museum. He represents the hybrid figure of the Alexandrian poet-scholar, equally engaged in creative writing and grammatical research.

His known works fall into two categories. As a grammarian, he wrote a three-volume scholarly treatise titled Glossai (Glosses), which explained difficult words in Homeric and other poetic texts. This work is now lost, but it places him among the pioneers of systematic literary scholarship in Alexandria. As a poet, he is best known for his innovative "pattern poems" (technopaignia), where the words were arranged on the page to form a shape related to the subject. Surviving titles include The Egg, The Wings, and The Spider, poems shaped like an egg, a pair of wings, and a spider's web. A fourth poem, Gorgo and Perseus, is known only by title. These visual experiments are among the earliest known examples of concrete poetry in Greek literature.

According to modern scholars, Simmias's dual career exemplifies the Alexandrian ideal of combining poetic creativity with philological learning. His glosses contributed to the foundation of Homeric studies, while his pattern poems influenced later Hellenistic poets and remain a noted curiosity in the history of literary form.